Mailboxes disappear after upgrading to Ispconfig 3.05.2

I have been running the perfect server Ubuntu 10.10 for a year now w/o problems, until yesterday; when I decided to upgrade to the newer ispconfig 3.05.2
I ended up with following symptoms:
-no mail boxex under mail | email mailbox (35 boxes on server for 3 domain names)
-there are 2 email aliases under mail | mail alias (correct)
-all emails (users) appear ok under spam tab
-under (statistics) tab: quotas shows all emails - but (traffic) tab no account shows

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so far I haven't been able to find a similar problem here or google, so, could someone help?
side note: when I ran the upgrade command I selected all default values.
TIA